Final answer:
Gray is considered to be the central figure of the Romantic era in British literature.
Step-by-step explanation:
The correct answer is a) Romantic. Gray is considered to be the central figure of the Romantic era in British literature. Romanticism was a literary and artistic movement in the 18th and 19th centuries that emphasized the value of nature, feelings, and individual imagination. It was a reaction against the Enlightenment and Industrialization and had a sense of nostalgia for the past.